Question

If x = 4, y = -8 and z = 5, what is the value of
25(x + y)2 – 20(x+y)(y+z) + 4(y + 2)2 ​

Answer 1

Step-by-step explanation:

x=4,y=-8,z=5

so,

25(4+(-8)2–20(4+(-8)(-8)+5)+4(-8+2)2

(100-200)2-(80+160)(160-100)+(-32+8)2

(200-400)-(14400)+(-64+16)

(-200)-(14400-48

-200-14400-48

-14468

Answer 2

substitute the values in the expression.

25(4 + -8) 2-20 (2+5)(-8+5) +4 (-8+2)^2

25*4= 100 25*-8= 200

100+200= 300

300 -18 (2+5)(-8+5) +4 (-8+2)^2

2(-8+5) 5(-8+5)

= -16+ 10 * -40 + 25

-26 * -65  

1690

300 - 18 + 1690 - 1024

=948